/Engine/Source/Runtime/ImageCore/Public/DDSFile.h
One of these for each mip of a DDS.
struct FDDSMip
uint8 *
Data
int64
DataSize
uint32
Depth
uint32
Height
int64
RowStride
Note: pixels in DDS data must be densely packed, they exist for ease of addressing but you can't represent strided data in this form.
int64
SliceStride
uint32
Width